Slush-pump piston



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application led ltovemlierlt, 1926. Serial to. ie,53.

Although my present application is entitled as referring to a slush pump piston, it should be understood not only that my invention relates more particularly to a novel type oi packing'sleeve,for use upon slush pump pistons, but also that said packing .sleeve'and the piston comprising the same may be employed upon pistons for any desired use., I

lt isan especial object of my invention to providea slush pump piston'vvhich includes a 'main body lmovable by a'piston rod and comprising' -a central sectiondisposed be-` tween outwardly extending a'nges, said central section and llanges, cooperating in the provision ontl a sin le annular channel for a' packingsleevew ich is retainedl between said anges in suchmanner as 'to permit the respective edges of said-sleeve, extending parallel with said flanges, tomove out wardly in response to an internal pressure;

vention, uid being admitted into said`chan-v v ment of fluid rom said annular channel, and

` sleeve maybe inwardl -enlarged and/r a manner tending to nel from yone or both ends of said body, the central portion of Said sleeve is`restrained in revent its participation `inthe mentione .outward movement.

Other objects of. myv invention,` in which;v- I mayuse valve means ofany preferred type, 33 or valves of the special types hereinafter described, `to revent or check return moves` in which the central portion of saidpacking provided with a band-l e vinterior or other reinforcement, may 'bebest a preciated from'v illustrative embodiments o my invention,

taken in connectionwiththe appended claims and the accompanying. drawings,.in

which:

Fig. l-fmay be referred toas ya median longitudinal section through a pump plunger `embodying my inventiong, 'v A Fig. 2 is a view similar to Fig. 1, but

. showing an alternative type of plunger Abody,sa'id body being 'provided with a simple alternative type of valve lmeans' :for

checking -return movement of fluid from an annular channel beneath a packingsleeve- Fig, 3 is a'detailview, separately showing in half section, an alternative 'type of packsleeve. f

eferring to the details of that specic ,embodiment 'of my invention illustrated in Fig.`1, I show a lunger body as secured up# on a :"Odll an as comprising mterfttmg members 12 and 13,-said members respec-'ltively comprising outwardly extending flanges 14 and 15 and respectively including a correspondingly tapered cavity 27 in the member12) becomes somewhat worn; and, in order to admit Huid-pressure to a single circumferentialchannel 28, as provided by the reduced central sections 20 and the out- Wardl extending'flangesfli andv15, I may .provi e the respective members 12 and 13 with valved passages, as indicated vat 29 andv 30,-ball'valves 31 being shown as outwardly pressed by springs 32. f The com ressive action of these spl-in s may be' varied by rotaobvious that l.the described. colistruction of a plunger body is moreadvantive`. adjustment 'o threaded seat` members tageousthan theuse of arene-piece body, in

that it -is .favorable to compensation'for 'vvear and toV assembly and disassembly; but yI desire herein to emphasize more particu# larly 4the character and advantages of packing sleeve of the general t e ilustrated.`

, Each 'of vmy. packing s eeves may comprise a unit having a substantially cylindrical outer/surface when subjected to no in; ternal pressure; but I show the same as comprising inwardl extending dan es 34, 34',

adapted respectlvely to be held y Iinterior 4pressure against inner radial surfaces 35 35-provided. by the respective Bauges 14 and 15; and it is an important feature of my novel packing sleeves that, although the mentioned inwardly extendingv flanges 34, 34', and lcylindrical portions 36, 36' lwith which said inwardly extendinglilanges are shown as integrally connected, may be suiciently flexible and extensible topermit outward movement in response to internal pressure, a central portion of each ofsaid acking sleeves is intended to4 be so thic ened llU (as at 37) or so bound or reinforced, as' to vtory fit, preventing leakage past said sleeve,

and compensating for wear) the central region 40 is prevented from participating in such outward movement, thereby obviating useless friction and prolonging the life of said sleeve. As the edges wear, they are pushed farther out.

-ln Fig. 2, in which l show a packing sleeve 21a substantially like .that ilustrated in Fig. 1, the main body of a plunger is shown as comprising three sections, rather than one or two,-a reduced central section' 2()a being shown as distinct from end flanges 14xi and l5".A rlhe latter may be secured theretoby the vclamping action of a nut 425a upon the end'of rod 11a, or they may be secured together by means such as screws 41,an important feature v of novelty in the organization shown in-Fig. 2 being 'my use of a very simple and effective valve organization comprising a single and comparatively heavy rubber band 42, shown as dis posed withina peripheral channel 43a. This band partially fills said` channel in such manner as to be retained thereby although v permitting ingress and preventing egress of fluid through passages shown at 44 in the central section 20 and at 45a in the flanges 14a and 15a.

By Way of emphasizingthe fact that the interior configuration of my packing sleeves may be varied, I ,showin Fig. 3 an alternative form in which a central region 37b is inwardly thickened in such manner as to provide a rounded surface,'-the use of reinforcing band" 38 or 38b being entirely optional, and all embodiments of my invention being Vsuch as to provide a single pressure chamber (46, 46a, 46") surrounding a central section of the plunger body and within a packing sleeve. p

. 'lt will be obvious 'that a pump plunger 'of the general character ,described mayI be used, in a known manner, to pump slush or another fluid to which one or both of the `flanges 14, 15 (or 14, 15a) may be exposed,

uid pressure being transmitted through the passages 29'and 3() (or 44, 45a) into the `annular space 46,-therebyforcing both edges of the packing sleeve 21 (or 21a or 21h) outward into satisfactory contact with a cylmder wall, to avoid leakage past said plunger and to assure a high efficiency in the' operation thereof; and, although all of the described parts may be, as shown, of comparatively rugged construction, the described, packing sleeve is especially advantageous not only as providing automatic means to assure andmaintain a satisfactory fit' but as providing automatic means for expanding the edges thereof to compensate for wear. l

Although l have herein -described alternative embodiments of my invention, it should be understood not only that various features described may be independently employed but also -that numerous modifications, additional to'those herein described, which might easily be devised by those skilled in theI arts to which this case relatgs,-without involving the slightest departure from the spirit and scope of my invention as the same is indicated above and in the following claims.

l claim as my invention:

1. In va pumping organization: a plunger body comprising a central section disposed between outwardly extending radial flanges which cooperate therewith in providing a single annular chamber; meansl for admitting fluid pressure into said annular chamber from lone end of said body; and a packing sleeve floating in said annular chamber and provided with means for restraining \a central portionv thereof, said pressureadmitting means being provided with 'an inwardl vopening valve consisting of a band of yiel able material extending over said fluid passages formed in said central section.

2. In a-pumping organization: a plunger `body comprisinga central section disposed between outwardly extending radial flanges which cooperate therewithin providing a single annular chamber; means for admitting fluid pressure into said annular' chamber from one end of said body; and a packing sleeve floating in said annular chamber and provided with means for checking outward `movement of the centralv portion thereof; :said checking means comprising a reenforcing band.

l3. An organization of the general character defined in claim" 1 in which said means for checkingoutward movement of the central portion of said packing sleeve comprises a reinforcing'band, about which said sleeve is cast.

For use in a pump plunger: a packing sleeve comprising a cylindrical body which is provided with inwardly extending flanges at its respective ends and with means for restraining its central portion against outward movement, said restraining means comprising a band imbedded therein.

5.. In a pumping organization: a plunger body comprisingfa central section disposed betwenvoutwardly extending radial flanges eol which. cooperate therewith in providing a single annular chamber; means for admitting fluid pressure into said annular chamber; and a packing sleeve oating in said annular chamber, said pressure-admitting means being provided with an inwardly opening valve consisting of a band of yieldable material extending overluid passages formed in said central section.

6. ln a pumping organization: a plunger body comprising a central section disposed between outwardly extending radial anges which cooperate therewith in providing a single annular chamber; means for admitting uid pressure into said annular chamber; and a packing sleeve oating in said annular chamber, said pressure-admitting means being provided with an inwardly opening valve consisting of a band of elastic material extending over Huid passages 2G formed in said central section.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 2nd day of November, 1926.

WAYNE N. i SUTLFF.. 

